反应详情

A 14.0 g amount of 4-amino-1,5-naphthalenedisulfonic acid is suspended in 100 ml of water and the solution is made basic with 5 N sodium hydroxide. The solution is warmed and absolute ether alcohol is added until a solid is precipitated. The solid is collected by filtration and is washed with 85% aqueous ethyl alcohol, ethyl alcohol and ether, then dried in vacuo to yield 12.0 g of 4-amino-1,5-naphthalenedisulfonic acid disodium salt.

1. temperatureThe solution is warmed
2. customis precipitated
3. filtrationThe solid is collected by filtration
4. washis washed with 85% aqueous ethyl alcohol, ethyl alcohol and ether
5. customdried in vacuo